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- W1982160717 abstract "Previous studies have proposed that specific translational pauses have evolved to promote protein folding inside the cell by temporally separating the folding of specific regions of some polypeptide chains during their synthesis. Here we show that this is the case for a bifunctional protein in Saccharomyces cerevisiae. The yeast TRP3 gene contains a translational pause comprising ten contiguous non-preferred codons within its second functional domain (indoleglycerol phosphate synthase). Site-directed mutagenesis was used to remove this translational pause by increasing the codon bias of the region without changing the amino acid sequence of the protein (to create the gene TRP3pr: pause replaced). The TRP3pr gene was able to complement a trp3:: URA3 null mutation in yeast. No significant differences in the doubling times of TRP3 or TRP3pr yeast transformants were observed during growth at 25 degrees C, 30 degrees C or 37 degrees C, or in the presence of sublethal concentrations of the analogue, 5-methyltryptophan. However, further analysis of TRP3 and TRP3pr transformants revealed that the removal of the translational pause causes a 1.5-fold decrease in indoleglycerol phosphate synthase activity per TRP3 mRNA. This observation which is statistically significant (P < 0.05) and reproducible, suggests that translational pausing promotes the correct intracellular folding of the TRP3 protein." @default.
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- W1982160717 date "1992-11-01" @default.
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- W1982160717 title "Protein folding within the cell is influenced by controlled rates of polypeptide elongation" @default.
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- W1982160717 doi "https://doi.org/10.1016/0022-2836(92)90486-4" @default.
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